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Large bodies of studies have shown that the CRISPR/Cas9-based library screening is a very powerful tool for the identification of gene functions. However, most of these studies have focused on protein-coding genes, and, furthermore, very few studies have used gene reporters for screening. In the present study, we generated DNA methyltransferase 3B (DNMT3B) reporter and screened a CRISPR/Cas9 synergistic activation mediator (SAM) library against a focused group of lncRNAs. With this screening approach, we identified Rhabdomyosarcoma 2-Associated Transcript (RMST) as a positive regulator for DNMT3B. This was confirmed by activation of the endogenous RMST by SAM or ectopic expression of RMST. Moreover, RMST knockout (KO) suppresses DNMT3, while rescue with RMST in the KO cells restores the DNMT3 level. Finally, RMST KO suppresses global DNA methylation, leading to the upregulation of methylation-regulated genes. Mechanistically, RMST promotes the interaction between the RNA-binding protein HuR and DNMT3B 3' UTR, increasing the DNMT3B stability. Together, these results not only provide the feasibility of a reporter system for CRISPR library screening but also demonstrate the previously uncharacterized factor RMST as an important player in the modulation of DNA methylation.
Pubmed ID: 31636039
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Founded in 1981, ZymoGenetics is a biopharmaceutical company focused on the development and commercialization of therapeutic proteins. ZymoGenetics is publicly traded (NASDAQ: ZGEN) and headquartered in Seattle, Washington in the historic Seattle City Light Steam Plant building. Our mission is to create novel protein drugs that will significantly help patients fight their diseases. We have contributed to the discovery or development of six recombinant protein products now marketed by other companies. Current programs target viral infection, cancer, inflammatory diseases and bleeding. Our first internally developed product, RECOTHROM Thrombin, topical (Recombinant), was approved by the U.S. Food and Drug Administration (FDA) on January 17, 2008 for use as a topical hemostat to control moderate bleeding during surgical procedures and is now marketed in the United States. We have a promising pipeline of novel therapeutics, which we are developing on our own or in collaboration with partners.
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